Migration issues while converting from Blaze 5.5 to Blaze 6.8

Iam migration blaze 5.5 version code to new version i.e blaze 6.8 and while importing blaze 5.5 to new version, import failed with below error.

Below is the message from Blaze 6.8 IDE

There were 3 exceptions while initializing the Java class provider resource.com.blazesoft.engines.rules.java.NdJavaClassImportResourceException: An exception occurred while adding the 'com.glic.esm.error.ErrorHelper' Java class to the Java class provider resource.java.lang.NullPointerExceptioncom.blazesoft.engines.rules.java.NdJavaClassImportResourceException: An exception occurred while adding the 'com.glic.esm.rules.util.BenefitCoverageUtil' Java class to the Java class provider resource.Could not initialize class com.glic.esm.error.ErrorHelpercom.blazesoft.engines.rules.java.NdJavaClassImportResourceException: An exception occurred while adding the 'com.glic.esm.rules.common.SystemConfiguration' Java class to the Java class provider resource.Could not initialize class com.glic.esm.error.ErrorHelper

I found out one external Java Class (ErrorHelper) which is causing issue. This class gets logger object instance from customized logger class which we built to use in all modules. This is perfectly fine with existing Blaze 5.5 version without any issues.